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Post  Admin on Tue Sep 27, 2011 9:16 pm

Quick and easy way to make venturi gaskets. Factor10
I have been making venturi gaskets for years now and I have tried many different ways. The best way so far is the way I'm going to describe below. All you'll need is a fresh sharp razor blade, bamboo skewer, and some Sullivan silicone fuel tubing.

Quick and easy way to make venturi gaskets. -412

Slip the fuel tubing onto one of the ends of the skewer. While holding your razor blade tightly in one hand, steadily rotate the skewer slowly clockwise. I would suggest you go clockwise so you can see when the cut is finished and it also helps in cutting a straight edge.

Quick and easy way to make venturi gaskets. Cuttin10

You can make one or continue up the fuel tubing and make as many as you can. Sure there may be some messed up ones (too thick, too thin, uneven edge...).

Quick and easy way to make venturi gaskets. New_cu10

Just slide them off the skewer and you're ready to install them!

Quick and easy way to make venturi gaskets. Ventur10
Quick and easy way to make venturi gaskets. -711


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Last edited by Admin on Thu Feb 19, 2015 3:35 pm; edited 4 times in total (Reason for editing : Replaced missing pictures)
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Post  Carl on Tue Sep 27, 2011 9:50 pm

I have never bought a venturi gasket as a part. i have always made them myself. the fuel tubing you are using should work but it has a small inner circumference. I used to use some black fuel tubing that was soft and had the large inner circumference about the same size as the original venturi gasket.
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Post  microflitedude on Tue Sep 27, 2011 10:33 pm

Thanks so much! I think I'll go make one for my babe bee.
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Post  andrew on Tue Sep 27, 2011 10:42 pm

Nicely done.

I always keep a couple of packs of bamboo skewers of different sizes on hand all the time. For 1/2A (and in foamies), they have a lot of uses in building. They're tough, will flex before breaking, and CHEAP. They make great pushrods.
If you haven't used them, pick up a pack and you'll find lots of applications, if for nothing else other than mixing epoxy.
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Post  Admin on Tue Sep 27, 2011 11:29 pm

Thanks, making venturi gaskets from fuel tubing is probably as old as the bee engines themselves. Mostly crap people come up with when they are stranded out at the field with a sad Babe Bee. If anyone is interested, I could put together a "How to make reed valves out of floppy discs" topic. I would probably have to do that tomorrow though.


Last edited by Admin on Tue Sep 27, 2011 11:42 pm; edited 1 time in total (Reason for editing : fix some text)
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Post  andrew on Tue Sep 27, 2011 11:41 pm

Admin wrote:If anyone is interested, I could put together a "How to make reed valves out of floppy discs" topic.

A good "Show and Tell" article would be great. I've been using floppies for some time for reeds. You can use acetone to completely clean the oxide from the surface leaving a clear mylar disk. I don't know if it makes any difference, but not having the oxide in the engine can't hurt.
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Post  Admin on Thu Aug 23, 2012 2:04 pm

I have now made the how to on making reeds out of floppy disks!

https://www.coxengineforum.com/t3064-how-to-make-reed-valves-out-of-a-floppy-disk

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Post  roddie on Thu Feb 19, 2015 11:55 am

Another method of making venturi gaskets for the Bee "in a pinch".. is to find some thick cardstock and punch/drill a 9/64" hole (.140") approx. 1/2" in from an edge. Using a scissor-type standard hole-punch; center the hole in the "eye" of the punch and proceed to punch-out your gasket. If too thin.. make a second one. It's so easy.. you'll probably want to make a bunch!

I actually made these using 1/8" and a 1/4" hole punches.

Card-stock..

Quick and easy way to make venturi gaskets. Dsc02513
Quick and easy way to make venturi gaskets. Dsc02514

and rubber from an inner-tube..

Quick and easy way to make venturi gaskets. Dsc02515

Inner-tube rubber is a little "thick".. but will compress when tightening the four tank screws. A "Playtex" kitchen-cleaning glove is just about the perfect thickness of material to use.

Close enough for horseshoes and hand grenades.. Smile
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Post  RknRusty on Thu Feb 19, 2015 12:04 pm

Thanks Roddie. I never cared for the ones we buy, and I always suspect them when anything seems won'y about the engine runs.
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Post  GallopingGhostler on Thu Feb 19, 2015 3:22 pm

Glad to see others have given it a shot with success. I was lacking an O-ring gasket for the Babe Bee, and Sullivan fuel tubing came to the rescue two years ago. I'm also finding the newer RTV sealants work as good gasket replacements on my larger engines.

I love to hear success stories. Thumbs Up
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Post  Admin on Thu Feb 19, 2015 3:37 pm

Good idea Roddie!

I replaced the missing pictures.

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Post  getback on Thu Feb 19, 2015 7:36 pm

from the other post Cold  
been making them awhile but have not tried the skewer . I have been using a sharp pair of small dikes and stretching the ring over the tube with a probe pick and my finger nail holding it in place.  makes a really good seal . Haven't tried the floppy disc for reeds but need to just another way to cut back on expenses. I use to get O-rings from 2 cycle engine carb. kits from work but not no more  What? I still have A friend that will save them for me  Thumbs Up    
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Post  Mark Boesen on Fri Feb 20, 2015 12:53 am

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Post  ikuraprime on Sat Jul 08, 2017 10:22 am

Followed the link posted here and bought the set. They fit perfectly. Soaked one in Nitro 25% Glow Fuel for 8 days and the rubber seems fine and unchanged. Asked there what kind of rubber but no reply. Just in case you wanted to know. Regards
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Post  Mark Boesen on Sat Jul 08, 2017 11:17 am

I've used them for years and think they're better then OEM.
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Post  ikuraprime on Sat Jul 08, 2017 2:26 pm

So cool to know! I've been out of the Cox 'everything' for more than 43 years now but last month too much wine made me buy a 1963 PT-19 I'm souping/restoring up, which meant the engine too. I had bought a gasket off ebay and it just squished flat and remained flat- almost broke apart.
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Post  roddie on Wed Aug 02, 2017 3:06 pm

I just made these using my aforementioned "hole-punch" technique..

Quick and easy way to make venturi gaskets. Kitche10
Quick and easy way to make venturi gaskets. Kitche11
Quick and easy way to make venturi gaskets. Kitche12

The "purple" material was cut out from the cuff of a common kitchen-glove. It is spongy-rubber (Latex??) and .015" (.4mm) thick. The plastic sheet was needed for some rigidity behind the rubber to get a clean cut-out of the gasket using the paper-punch. The plastic is only .005" thick.. and might be a good material for making reeds.

It seems that a "single-thickness" of this rubber should do the job as a gasket.. because when assembling the tank-bowl to the backplate, there's a very slight gap that closes with a light "pinching-together" of the assembly.

Incidentally.. punching some 1/4" blanks of this rubber and piercing the centers with an awl might make good gaskets for sealing underneath the case-screw heads in the backplate.. or helping to seal a backplate that's damaged where the screws seat. Smile
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Post  NEW222 on Wed Aug 02, 2017 8:13 pm

roddie wrote:I just made these using my aforementioned "hole-punch" technique..

Quick and easy way to make venturi gaskets. Kitche10
Quick and easy way to make venturi gaskets. Kitche11
Quick and easy way to make venturi gaskets. Kitche12

The "purple" material was cut out from the cuff of a common kitchen-glove. It is spongy-rubber (Latex??) and .015" (.4mm) thick. The plastic sheet was needed for some rigidity behind the rubber to get a clean cut-out of the gasket using the paper-punch. The plastic is only .005" thick.. and might be a good material for making reeds.

It seems that a "single-thickness" of this rubber should do the job as a gasket.. because when assembling the tank-bowl to the backplate, there's a very slight gap that closes with a light "pinching-together" of the assembly.

Incidentally.. punching some 1/4" blanks of this rubber and piercing the centers with an awl might make good gaskets for sealing underneath the case-screw heads in the backplate.. or helping to seal a backplate that's damaged where the screws seat. Smile

Awesome Idea. I will have to look into a couple of holepunches for this alone! And I'll hear the screaming from down here when the other half washes the dishes.... Shocked
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Post  roddie on Wed Aug 02, 2017 11:52 pm

NEW222 wrote:

Awesome Idea. I will have to look into a couple of holepunches for this alone! And I'll hear the screaming from down here when the other half washes the dishes.... Shocked


Just blame me Chancey!!!!
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Post  Mark Boesen on Thu Aug 03, 2017 1:06 am

....for the cost of a pair of dishwashing gloves or a hole punch, you could just buy a couple dozen o-rings?
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Post  Mark Boesen on Thu Aug 03, 2017 1:13 am

It's interesting that the first run of Babe Bees didn't used the 'fillister' head screws and had leak issues:
Quick and easy way to make venturi gaskets. 002_210
Quick and easy way to make venturi gaskets. 006_310
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Post  roddie on Thu Aug 03, 2017 3:03 pm

Mark Boesen wrote:....for the cost of a pair of dishwashing gloves or a hole punch, you could just buy a couple dozen o-rings?

This is true Mark.. but many people already have these items at home.. and in a pinch, sometimes you have to be inventive. Laughing .
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Post  RknRusty on Thu Aug 03, 2017 4:34 pm

These dishwashing gloves might be the best home made gasket yet. They're cute too, maybe I'll get some pink ones, easy to find on the dirty floor.

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Post  Mark Boesen on Thu Aug 03, 2017 6:01 pm

roddie wrote:
Mark Boesen wrote:....for the cost of a pair of dishwashing gloves or a hole punch, you could just buy a couple dozen o-rings?

This is true Mark.. but many people already have these items at home.. and in a pinch, sometimes you have to be inventive. Laughing .

lol, just trying to help out the home life, i hate to say, but i know from personal experience the better half doesn't alway appreciate inventiveness :^ (...
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Post  Bob A on Wed Aug 14, 2019 9:49 pm

It seems to me that if an accurate size measurement and/or correct stock number could be found for the Cox venturi O rings, that a lifetime supply of a box of 100 or more could be purchased at a reasonable price from a commercial O ring supplier. Has anyone ever done this? Bob A
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